What are Thomas and Chess's classic temperamental categories?

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Doctors Thomas and Chess were child psychologists who developed a system in which the behavior of children can be classified based on the following nine levels of temperament:

Activity level: Children either want to move and be active, or are more content being sedentary and remaining in one place.

Distractibility:  ...

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Doctors Thomas and Chess were child psychologists who developed a system in which the behavior of children can be classified based on the following nine levels of temperament:

Activity level: Children either want to move and be active, or are more content being sedentary and remaining in one place.

Distractibility: How well does a child pay attention when he or she is involved in something that is not interesting?

Intensity: This can be related to positive or negative responses. How passionately does a child react to stimuli?

Regularity: Does a child follow a set pattern with eat and sleep schedules, or does there seem to be a lack of a consistent schedule?

Sensory threshold: How many sensory experiences (sound, taste, touch) are needed to evoke a response in a child?

Approach/Withdrawal: Does the child easily approach and adapt to new situations and people?

Adaptability: This is related to how well a child can move from one activity to the next.

Persistence: This speaks to how well a child is able to stay on a task, particularly a difficult one.

Mood: Does the child generally react to circumstances in a positive or a negative way?

Based on these nine temperaments, most children can then be classified as "easy," "difficult," or "slow-to-warm-up."

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